If you're one of the top streamers, with decent financial literacy, you will easily make enough to retire by 30 if you started streaming at say 20.
This is just like any other endeavor. Many try, most fail, some succeed wildly. We don't need to feel bad for the people that try and fail. That is part of life and progressing as a person.
If you have 250 viewers a few times a week, you're not quitting your day job for it. If you are, you should probably reconsider.